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        <h2 id="大整数加法"><a href="#大整数加法" class="headerlink" title="大整数加法"></a>大整数加法</h2><p>实现字符串加法<br><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">add</span>(<span class="params">a,b</span>)</span>&#123;</span><br><span class="line">   <span class="keyword">var</span> result = [], count = <span class="number">0</span>;</span><br><span class="line">   <span class="keyword">var</span> arrA = a.split(<span class="string">''</span>);</span><br><span class="line">   <span class="keyword">var</span> arrB = b.split(<span class="string">''</span>);</span><br><span class="line">   <span class="keyword">var</span> length = arrA.length &gt; arrB.length ? arrA.length : arrB.length;</span><br><span class="line">   <span class="keyword">for</span>(<span class="keyword">var</span> i=<span class="number">0</span>;i&lt;length;i++)&#123;</span><br><span class="line">      <span class="keyword">var</span> temp = (~~arrA.pop() + ~~arrB.pop()) + count;</span><br><span class="line">      <span class="keyword">if</span>(temp &gt;= <span class="number">10</span>)&#123;</span><br><span class="line">         temp = temp - <span class="number">10</span>;</span><br><span class="line">         count = <span class="number">1</span>;</span><br><span class="line">      &#125;<span class="keyword">else</span>&#123;</span><br><span class="line">        count = <span class="number">0</span>;</span><br><span class="line">      &#125;</span><br><span class="line">      result.unshift(temp);</span><br><span class="line">   &#125;</span><br><span class="line">   result.unshift(count);</span><br><span class="line">   <span class="keyword">return</span> result.join(<span class="string">''</span>).replace(<span class="regexp">/^0+/</span>,<span class="string">''</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>

      
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